﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.OracleClient;
using System.Data;
using System.Configuration;

namespace SQL
{
    public class DBHelperOracle
    {
        public static OracleConnection conn = null;
        public static OracleCommand cmd = null;

        //以下是参考数据库连接字符串的写法
        //public static string cstr = "Data source=127.0.0.1;user id=system;password=skycount;SERVICE_NAME=SKYCOUNT;";
        //public static string cstr = "Data Source=water;User ID=system;Password=skycount;Unicode=True";
        //public static string cstr = "User ID=tvtobi;Password=tvtobi;Data Source=(DESCRIPTION = (ADDRESS_LIST= (ADDRESS = (PROTOCOL = TCP)(HOST = 59.201.16.100)(PORT = 1521))) (CONNECT_DATA = (SERVICE_NAME = orcl)))";

        public static string cstr = ConfigurationManager.AppSettings["ConnectionString"].ToString();

        public DBHelperOracle()
        { }

        #region 建立数据库连接对象
        /// <summary>
        /// 建立数据库连接
        /// </summary>
        /// <returns>返回一个数据库的连接OracleConnection对象</returns>
        public static OracleConnection init()
        {
            try
            {
                conn = new OracleConnection(cstr);
                if (conn.State != ConnectionState.Open)
                {
                    conn.Open();
                }
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return conn;
        }
        #endregion


        #region 设置OracleCommand对象
        /// <summary>
        /// 设置OracleCommand对象       
        /// </summary>
        /// <param name="cmd">OracleCommand对象 </param>
        /// <param name="cmdText">命令文本</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        private static void SetCommand(OracleCommand cmd, string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            cmd.Connection = conn;
            cmd.CommandText = cmdText;
            cmd.CommandType = cmdType;
            if (cmdParms != null)
            {
                cmd.Parameters.AddRange(cmdParms);
            }
        }
        #endregion


        #region 执行相应的sql语句，返回相应的DataSet对象
        /// <summary>
        /// 执行相应的sql语句，返回相应的DataSet对象
        /// </summary>
        /// <param name="sqlstr">sql语句</param>
        /// <returns>返回相应的DataSet对象</returns>
        public static DataSet GetDataSet(string sqlstr)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion


        #region 执行相应的sql语句，返回相应的DataSet对象
        /// <summary>
        /// 执行相应的sql语句，返回相应的DataSet对象
        /// </summary>
        /// <param name="sqlstr">sql语句</param>
        /// <param name="tableName">表名</param>
        /// <returns>返回相应的DataSet对象</returns>
        public static DataSet GetDataSet(string sqlstr, string tableName)
        {
            DataSet set = new DataSet();
            try
            {
                init();
                OracleDataAdapter adp = new OracleDataAdapter(sqlstr, conn);
                adp.Fill(set, tableName);
                conn.Close();
            }
            catch (Exception e)
            {
                throw new Exception(e.Message.ToString());
            }
            return set;
        }
        #endregion


        #region 执行不带参数sql语句，返回所影响的行数
        /// <summary>
        /// 执行不带参数sql语句，返回所影响的行数
        /// </summary>
        /// <param name="cmdstr">增，删，改sql语句</param>
        /// <returns>返回所影响的行数</returns>
        public static int ExecuteNonQuery(string cmdText)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                count = cmd.ExecuteNonQuery();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion


        /// <summary>
        /// 返回执行是否成功
        /// </summary>
        /// <param name="cmdText"></param>
        /// <returns></returns>
        public static bool Execute(string cmdText)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand();
                cmd.CommandText = cmdText;
                cmd.Connection = conn;
                count = cmd.ExecuteNonQuery();
            }
            catch (Exception ex)
            {
                IO.CheckFolder(AppDomain.CurrentDomain.BaseDirectory + "\\Log\\", true);
                System.IO.File.AppendAllText(AppDomain.CurrentDomain.BaseDirectory + "\\Log\\LOG.TXT", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "   public static bool Execute(string cmdText)" + Environment.NewLine + ex.Message + Environment.NewLine + ex.StackTrace + Environment.NewLine);
                System.IO.File.AppendAllText(AppDomain.CurrentDomain.BaseDirectory + "\\Log\\LOG.TXT", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "   SQL:" + cmdText + Environment.NewLine + ex.Message + Environment.NewLine + ex.StackTrace + Environment.NewLine);
                return false;
            }
            finally
            {
                conn.Close();
            }
            return true;
        }

        #region 执行带参数sql语句或存储过程，返回所影响的行数
        /// <summary>
        ///  执行带参数sql语句或存储过程，返回所影响的行数
        /// </summary>
        /// <param name="cmdText">带参数的sql语句和存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        /// <returns>返回所影响的行数</returns>
        public static int ExecuteNonQuery(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            int count;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                count = cmd.ExecuteNonQuery();
                cmd.Parameters.Clear();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return count;
        }
        #endregion


        #region 执行不带参数sql语句，返回一个从数据源读取数据的OracleDataReader对象
        /// <summary>
        /// 执行不带参数sql语句，返回一个从数据源读取数据的OracleDataReader对象
        /// </summary>
        /// <param name="cmdstr">相应的sql语句</param>
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>
        public static OracleDataReader ExecuteReader(string cmdText)
        {
            OracleDataReader reader;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return reader;
        }
        #endregion


        #region 执行带参数的sql语句或存储过程，返回一个从数据源读取数据的OracleDataReader对象
        /// <summary>
        /// 执行带参数的sql语句或存储过程，返回一个从数据源读取数据的OracleDataReader对象
        /// </summary>
        /// <param name="cmdText">sql语句或存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">参数集合</param>
        /// <returns>返回一个从数据源读取数据的OracleDataReader对象</returns>
        public static OracleDataReader ExecuteReader(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            OracleDataReader reader;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                reader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return reader;
        }
        #endregion


        #region 执行不带参数sql语句,返回结果集首行首列的值object
        /// <summary>
        /// 执行不带参数sql语句,返回结果集首行首列的值object
        /// </summary>
        /// <param name="cmdstr">相应的sql语句</param>
        /// <returns>返回结果集首行首列的值object</returns>
        public static object ExecuteScalar(string cmdText)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand(cmdText, conn);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion


        #region 执行带参数sql语句或存储过程,返回结果集首行首列的值object
        /// <summary>
        /// 执行带参数sql语句或存储过程,返回结果集首行首列的值object
        /// </summary>
        /// <param name="cmdText">sql语句或存储过程名</param>
        /// <param name="cmdType">命令类型</param>
        /// <param name="cmdParms">返回结果集首行首列的值object</param>
        /// <returns></returns>
        public static object ExecuteScalar(string cmdText, CommandType cmdType, OracleParameter[] cmdParms)
        {
            object obj;
            try
            {
                init();
                cmd = new OracleCommand();
                SetCommand(cmd, cmdText, cmdType, cmdParms);
                obj = cmd.ExecuteScalar();
                conn.Close();
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message.ToString());
            }
            return obj;
        }
        #endregion
    }
}
